Film and slide projector mechanism having unitary cabinet means and screen



o@ 25 1949- A. M. DAvocK 2,485,709

FILM AND SLIDE PROJECTOR .MECHNISM HAVING UNITARY CABINET MEANS NDSCREEN Filed Nov. 4, 1946 4 Sheets-Sheet 1 Oct. 25, 1949. A. M. DAvocK2,485,709

FILM AND SLIDE PROJECTOR MECHANISM HAVING UNITARY CABINET MEANS ANDSCREEN Filed Nov. 4, 1946 4 Sheets-Sheet 2 IN VEN TOR.

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Oct. 25, 1949. A. M. DAvocK 2,485,709

FILM AND SLIDE PROJECTOR MECHANISM HAVING UNITARY CABINET MEANS ANDSCREEN Filed NOV. 4, 1946 4 Sheets-Sheet 3 IN VEN TOR.

, y 2) /gf/"/ 7: gag/aff sa BY u M ,yrraH/VEX Oct. 25, 1949. A M DAVOCK2,485,709

FILM AND SLIDE PROJECTOR MECHANISM HAVING UNITARY CABINET MEANS ANDSCREEN Filed Nov. 4, 1946 4 Sheets-Sheet 4 Patented Oct. 25, 1949 FILMAND SLIDE PROJECTOR MECHANISM HAVING UNITARY CABINET MEANS AND SCREENuna M. Invoer, ummm, Mien.. minou? to The Jam Handy Organisation. Inc.,Detroit.

Mich., a corporation of Delaware Application. November 4, 1946, SerialNo. 707,857

9Claims. l

This invention relates to projector mechanism' especially useful for thepurpose of displaying slide film, nlm slides or glass slides on a screenmounted within the projector casing or cabinet. In particular theinvention relates to a unitary projector assembly comprising a casingcontaining the projector proper and carrying at the front ofthe casing atranslucent viewing screen upon which successive pictures are displayedby projecting them onto the inner surface of the screen through mirrorsor reecting surfaces interposed between the projector lens and thescreen.

An object of the invention is to provide a projector unit comprising anenclosing casing within one side of which is mounted a projector and inwhich a translucent viewing screen is mounted within an opening in thefront wall of the casing at one side of the projector, the improvedconstruction being such as to provide a compact unit of minimumdimensions wherein the screen is offset to one side in the front wall.

of the casing thereby enabling the projector to be mounted alongside thescreen without, however, interfering with the projection of the picturesthereon.

A further object of the invention is to provide a self-containedportable viewing unit of relatively small and compact constructionadapted, for example. to be placed upon a table or desk for viewingpictures, said unit embodying an enclosing casing capable of beingattractively designed, such as in streamlined fashion, by reason of theimproved arrangement within the casing of the projector mechanism,reflecting mirrors and translucent screen.

Another object of the invention is to provide a lm projecting unitcomprising a casing within which the projector mechanism is mounted andwherein improved means is provided for enabling the film strip to beloaded quickly and easily into the projector and guided past the lightaperture therein.

Still another object of the invention is to provide a tllm projectingunit in which the casing is provided in the top wall thereof with a lmloading slot communicating with a film receiving guide or trackextending downwardly past the light aperture or film gate in a projectormounted within the casing, the improved construction permitting the illmto be inserted into the slot in the casing and thence readily shiftedthrough the guide into proper position with respect to the lightaperture and the teeth of the iilm advancing sprocket without requiringthe casing 2 to be opened in order to manipulate the film ornecessitating any manual handling of the film after it has been fed intothe nlm guide or track.

Other objects of this invention will appear in'A the followingdescription and appended claims, reference being had to the accompanyingdrawings forming a part of this specication wherein like referencecharacters designate corresponding parts in the several views. y, t

Fig. l is a perspective view 'of a projector viewing unit constructed inaccordance with one embodiment of the present invention.

Fig. 2 is an enlarged vertical section taken substantially through lines2 2 of Fig. 1 looking in the direction of the arrows.

Fig. 3 is an enlarged horizontal section taken substantially throughlines 3 3 of Fig. 2 looking in the direction of the arrows.

Fig. 4 is an enlarged horizontal section taken substantially throughlines 4 4 of Fig. 3 looking in the direction of the arrows.

Fig. 5 is a detail section taken substantially through lines I B of Fig.4 looking in the direction of the arrows.

Fig. 6 is a fragmentary perspective view of the projector unit and aportion of the iilm guide illustrating the swinging illm gate in openposition.

Fig. 7 is a fragmentary central vertical section taken through the illmguide and gate with the latter in closed position.

Fig. 8 is a perspective view of a self-contained projector unit modifiedfor the use therewith oi iilm cr glass slides.

Fig. 9 is a fragmentary perspective view of the projector mounted withinthe casing of the unit shown in Fig. 8.

Before explaining in detail the present invention it is to be understoodthat the invention is not limited in its application to the details ofconstruction and arrangement of parts illustrated in. the accompanyingdrawings, since the invention is capable of other embodiments and ofbeing practiced or carried out in various ways. Also it is to beunderstood that the phraseology or terminology employed herein is forthe purpose of description and `not of limitation.

Referring to Figs. 1 to 'I inclusive of the drawings wherein there isillustrated, by way of example, a portable projector unit constructed inaccordance with one embodiment of the present invention, this projectorunit comprises a casing or cabinet generally indicated at A which isfabricated with enclosing walls which may be formed of any suitablematerial such as sheet metal, plastic sheeting or composition board withthe walls preferably shaped in streamlined fashion so as to present theldesired ornamental and attractive appearance. Thus, in accordance withthe invention a portable viewing unit of relatively light, small andcompact construction is provided which maybe placed upon a table or deskto enable persons sitting nearby to view pictures disp layed upon atranslucent screen mounted within an opening in the front of the casing.

The casing or cabinet A, in the ilustrated embodiment, comprisesl a mainpanel I bent into generally oblong shape to form top, bottom and frontwalls with the top and bottom walls converging rearwardly in streamlinedfashion, overlapped at vII at the back of the casing, and securedtogether in the locality of this overlapping joint, as by means of spotWelding. The casing also comprises vertical side panels I2 and I3, seeFig. 3, which are provided respectively with inwardly extending rearflanges I2a and I 3a overlapping the side edges of the main panel I0 andsecured thereto in any suitable manner. The side panels I2 and I3 arealso formed respectively with inwardly extending front flanges I2b andI3b which overlap the side edges of the front vertical wall of the mainpanel I0, being secured thereto in any suitable manner. With thisconstruction it will be seen that a substantially closed casing isvprovided which may be fully streamlined or otherwise shaped so as toafford the maximum in attractive appearance.

As` illustrated particularly in Figs. 1 and 3, the front vertical wallof the main panel I0 of the casing is provided with a front opening I4which is located off-center with respect to the front wall, as a resultof which the front wall has a relatively wide portion I 0a. at one sideof the opening and a relatively narrow portion IUb at the opposite sideof the opening. The offset front opening I4 in the casing is entirelyclosed by means of a translucent viewing screen I5. The flanges I2b andI3b of the side panels, as shown in Fig. 3, are inturned at I2c and I3c,respectively, to provide abutments against which the side edges of thescreen I5 rest. Similar abutment flanges I0c and IUrl are formed alongthe upper and lower edges of the opening' I4 against which the screen I5rests, and the screen is removably held in position by means of a numberof spring clips I6 securedat intervals to the anging around the edges ofthe screen opening I4.

Mounted within the casing A is a. vertical partition wall I1 whichpreferably extends fromthe bottom to the top of the casing. Thispartition wall, as shown in Fig. 3, engages the side edge of the screen"I5 adjacent the side flanging I3c thereby providing a partition space orcompartment I9 opposite the wider portion Illa of the front wall of thecasing, said compartment having a width corresponding approximately tothe width'of the wall portion Illa. The partition I1 is formed along itstop and bottom edges with lateral attaching flanges I'Ia by means ofwhich it is rigidly secured to the top and bottom walls of the casing,as by means of rivets I8.

The partition I1 extends rearwardly from the front of the casing asuitable distance to give the compartment I9 the desired depth forhousing ,the major portion of a suitable projector unit, I generallyindicated at B. This unit, in the illustrated embodiment, comprises ahorizontal base plate 20, see Fig. 2, having a depending flange a.abutting against the partition I1 andV secured thereto at 28h, as bymeans of bolts and nuts. The projector proper, which is mounted upon andsecured to the base plate 28, comprises in general a conventional lamphousing'ZI containing an electric lamp bulb which provides a source oflight of the desired density, the light rays therefrom passing through afront aperture in the lamp housing and thence through condenser lensesmounted in a casing 22 secured to the lamp housing. In front of thecondenser lens assembly is arranged a light shield 23 and a combinedfilm gate and guide structure generally indicated at 24, and laterdescribed in detail. Communicating with the film aperture in thisstructure is a. split lens supporting tube 25 within which is telescopeda lens holder 26 which is longitudinally adjustable in the tube 25 andlclamped in adjusted position in conventional manner by means of aclamping knob 21.

The light'rays issuing from the lens within the lens holder 26 aredirected rearwardly, as shown by the dot and dash lines in Fig. 5,against a small angularly positioned mirror or reflecting surface 28.From this surface the light rays are projected angularly and,horizontally, as shown by the dot and dash lines in Fig. 5, against arelatively large mirror or reflecting surface 29, and thence the lightrays are directed against the rear surface of the translucent screen I5.A picture thus projected against the inner surface of the screen I5 isvisible on the outside of the screen due to the translucent material ofwhich the screen is formed.

The light reflecting mirror 28 is supported upon an upright bracketplate 30 which has a horizontal attaching flange 3I bolted to the bottomof the casing. The mirror 28 is mounted upon a mirror base plate 32 andheld in position along its upper and lower edges by means of angleretainers 33 secured by means of screws 34 to the base plate 32. Thelatter is yieldingly mounted upon the bracket 30 by means of adjustingscrews 35 carrying small compression springs 36 interposed between themirror base plate 32 and the bracket plate 38, see Fig.. 3.

The mirror 29 is carried by a. vertical bracket plate 31 which has abottom attaching flange 38 bolted to the base of the casing. As in thecase of the mirror 28 the upper and lower edges of the mirror 29 areconfined by means of retainer clips 39 securedby means of screws 40 tothe bracket 31. The position of the mirror A29 with respect to itssupporting bracket 31 is preferably fixed whereas the mirror 28 may beadjusted slightly by means of the adjusting screws 35 in order todetermine its correct angular position with respect to the mirror 29 sothat the image will appear in proper position upon the viewing screenI5.

In the embodiment illustrated in Figs. l to 7 inclusive I haveillustrated improved film guiding means associated with the projector bymeans of whichv the film strip may be readily inserted through a slot inthe top of the casing and fed into proper relation to the projectorwithout requiring any manipulation of the lm within the casing.

Rigidly secured to the base plate 20 is a U- shaped bracket 4I havingupstanding spaced sides. Arranged between these upright sides of thebracket is fixed pressure plate 42 provided with rearwardly extendingattaching flanges 43 bolted to the upright sides of the bracket 4I. Asshown in Figs. 6 and 7, the xed pressure plate 42 is angularly formed toprovide a vertically extending portion 42a formed centrally thereof witha light aperture 44 and4 also to provide a lower portion 42h which isinclined downwardly and outwardly. This pressure plate is channelledcentrally throughout its length to provide a depressed or relievedportion 48 lying in a plane somewhat rearwardly of the plane of theremaining margin-al portions of the pressure plate, the width of thechannel or relieved portion corresponding substantially to fthe width ofthe picture frames 48a on the slide lm strip 48.

Cooperating with the xed pressure plate 42 is a yieldable pressure plate41 which, when the projector is closed, extends contiguously with andparallel to the -pressure plate 42 and, hence, is correspondingly shapedthroughout fits major length. Thus, the front yieldable pressure plate41 has a vertically extending portion 41a extending parallel kwith theportion 42a of the ilxed pressure plate and also has a downwardly andoutwardly inclined portion 41h extending parallel to the portion 42h.'I'he yieldable pressure plate extends between the spaced side anges ofa swinging gate or closure member 48 which is provided centrally thereofwith a light aperture 48. It will be understood thait when the projectorof the illustrated embodiment is mounted, as illustrated in Figs. 2 and3, within :the compartment |8 the projector gate 48 will be held inclosed position by a suitable latch (not shown) with the pressure platesin cooperating relation as shown in Figs. 2, 3 and 7.

Secured to the upper end of the yieldable pressure plate 41 are twolaterally spaced pins 58 upon which are mounted compression springs 8|.Secured to the lower end of the vertical portion 41a of the yieldablepressure plate are a pair of pins 82 upon which are mounted compressionsprings '88. The pairs of upper and lower spring supporting pins 88 and82 are guided at their outer ends in holes in the gai., member 48 and,hence, the springs are connned -under compression between the pressureplate 41 and the gate member. By virtue of this construction it will beseen that the pressure plate 41 is yieldingly mounted on the gate 48 andis capable of limited longitudinal movement fore and aft against theaction of rthe upper and lower springs 8| and 83. The yieldable pressureplate is provided centrally thereof with a light aperture 84 adapted toregister with the light apertures 44 and 48 when the projector isclosed. 'I'he yieldable pressure plate is also formed with a centrallongitudinal channel 88 extending the full length thereof andcorresponding to the channel 48 except reversely formed. Thus, when thepressure plates are in operative relation the channel or relievedportions 48 and 88 register =with each other and provide'a clearancespace through which the picture or picture frame portions 48a of theillm pass without contact with either pressure plate. The marginal edgeportions, however, of these pressure plates at opposite sides of thechannels will engage the edges of the lm outside the picture area andthis engagement will be of a yielding nature in accordance with thepressure exerted by the springs -'8| and 88. The gate member 48 issuitably hinged at 88 to the bracket 4| to permit the same to be swungoutwardly, as shown in Fig. 6, when :the projector is removed from thecabinet or casing A. The lens supporting tube 28 is rigidly attached tothe front side of the gate 48 in line with the light aperture 48thereof.

6 nlm 48 through the projector two pairs of guide pins are provided andarranged on the fixed pressure plate 42 so as to engage the edges of theiilm. A pair of laterally spaced guide pins 81 are mounted on thepressure plate 42 at opposite sides of the light aperture 44 therein.Below the guide pins 81 are arranged two guide pins 88 which also engagethe edges of the film strip as it passes through the projector. When thegate 48 is closed the guide pins 81 project into holes 81a in theyieldable pressure plate 41 and the guide pins 88 project intocorresponding holes in the lower inclined portion 41b thereof.

The nlm strip 48 is fed step by step through the -projector by means ofa sprocket 88 having spaced peripheral teeth 88a meshing lnsprocketholes 48h formed along opposite edges of the film. The teeth' of thesprocket project through slots 88 in the ilxed pressure plate and thesprocket is secured to a cross-shaft 8|. Mounted on the outer end ofthis shaft is a film advance knob 82 having a hub 82a embracing theshaft and se., cured thereto by a set screw 83. This hub projects into ahollow film framing knob 84 of substantially larger diameter than theknob 82. The illm framing knob 84 has a hub 84a rigidly secured by a setscrew 88 to a sleeve 88 free on the shaft 8|. 'I'he sleeve at the outerside of the bracket 4|, as shown in Fig. 4, has an annular flange 88aagainst which the hub 84a abuts. A' fiber washer 81 'is interposedbetween this flange and the bracket 4| and a similar ilber washer 88 ismounted on the sleeve 88 at the opposite side of the bracket. Alsomounted on the sleeve 88 is a spring washer 88 interposed between flatmetal washers 10, one of which engages the iiber washer 88 and the otherabuts against a fixed washer 1| on :the sleeve 88. The Spring washer 88thus causes the fiber washers 81 and 88 to engage frictionally thebracket 4| and, hence, resist turning of the framing knob 84. As shownin Fig. 5, a flat spring detent 18 is anchored at 12 to fthe inner wallAof the framing knob 84. This detent engages successively the four ilatsides of the hub 82a of the film advance knob 82, a compression spring14 being interposed between the detent and the ilanged rim of theframing knob. From the foregoing construction it will be seen that theiilm advance knob 82 may be turned step by step against the action ofthe spring detent 18 to shift I one picture frame 48a at a time intocorrect position opposite the light apertures 44 and 84. At each feedingstep of the film advance knob the spring detent 18 will engage one atside of lthe hub 82a, in the manner shown in Fig. 5, thereby holding thefeed sprocket 88 and the film in fixed position while the picture isbeing displayed on the screen I8. In order to adjust the illm so thatthe picture frames 48a will register correctly with the light apertures44 and 84, especially after initial loading of the lm in the projector,the framing knob 84 may be turned against the resistance offered by thefriction washers 81 and 88. When so turned the detent 13 will act as acoupling element to turn the nlm advance knob 82 and thereby rotate theshaft 8| and the sprocket 88 so as to shift Ithe lm longitudinally intocorrect p'osition with respect to the light apertures.

'Ihe side panel I3 of the casing or cabinet A is, in the presentembodiment, provided with a suitably shaped aperture or-opening 18 whichis closed by means of an inwardly recessed or embossed control panel 18secured around the marginal edges of fthe opening 18. The hub 84a of theframing knob projects through an aperture tion of the control panel withthe lm advance knob projecting -but slightly beyond the plane of thepanel |3. Also arranged on this panel -is a knob 11 connected to anyconventional mechanism for iadjusting the lens tube 26 longitudinally inorder to focus the lens. A light switch 19 is also mounted on thecontrol panel.

Cooperating with the vertical portion 42a of the fixed pressure plate 42is a film guide or track member 19 which is formed throughout its lengthwith a central channel 19a corresponding to the channel 45 but reverselyformed. The guide 18 is mounted in any suitable manner in x-ed position,such as by means of -a bracket (not shown) secured to the partition walll1. The vertical guide portion 42a and the guide 19 form cooperatingfilm tracks which extend upwardly from the projector through a slotvlill in 'the top panel I8 of the casing, see Figs. 1 and 2. The upperterminal ends of these film tracks 42a and 19 have outwardly flaredportions 8| and 82 projecting slightly above the upper surface of thepanel I8, thereby facilitating insertion of the end of the film 48.through the slot 80 and downwardly between the track or guide members42a and 19. The lower inclined portion 42h of the fixed pressure plateor guide member 42 has a, horizontal exten-sion 42o, see Fig. 2, andcooperating with this extension is a fixed horizontal guide member orfilm track 89. The superimposed film guides or-tracks 42e and 83 arecentrally-channelled in the same manner as shown at 45 and 55 so as torelieve :the picture frames of contact therewith as the film is fedbetween these guides or tracks. 'I'he upper horizontal track 83terminates adjacent the lower edge of the portion 41h of the yieldabiepressure plate and lthe ends of the lm tracks 83 and 42e projectoutwardly through a slot 84 at the rear end of the bottom wall of thecasing. v

From the foregoing it will be seen that the portions' 42a, 42h and 42Cof the fixed 4pressure plate form with theA vertical guide member 19,the yieldabie pressure plate 41 and the horizontal guide member 83substantially a continuous film` guide or track from the slot 80 in thetop wall of` the casing past `the light apertures in the projector andthence outwardly through the slot 84 in the rear end .of the casing. Thelm strip may, therefore, be inserted through fthe sl-ot 80` and shifteddownwardly between the track portions 42a land 19 into position betweenthe guide pins 51, 58 Ito permit the framing knob 64 to be operated soas to engage the teeth of the sprocket 59 with the sprocket holes in theedges of the film. The film strip will pass between the fixed'andyieldable pressure plates, during the loading of the film, by reasonof the yieldability of fthe springs and 53. Y

In order to prevent the film from climbing ol the sprocket teeth 59a,which would result ini causing the teeth to `cut the edges of thesprocket holes in the illm, the lower springs 53 acting upon theyieldable pressure plate 41 are made appreciably.v stronger or stifferthan the upper springs 5|. The greater strength of the lower springs,although not great enough to cause excessive pressure on the edges ofthe film or .prefvent the passage vbetween the pressure plates of thefilm strip during the loading operation, is preferably such as tomaintain the film in proper meshing relation with the sprocket teethregardless of the angular pull exerted by the film as it is fedrearwardly and out of the machine.

Referring to Fig. 8 the projector casing or cabinetis constructed mainlythe same as in Fig. 1. However, in the embodiment of Figs. 8 and 9 theprojector mounted within `the compartment |9 is vof thetype utilizingglass or lm slides instead of a film strip. The projector, generallyillustrated at C in Fig. 9, is mounted upon the base plate 20 withincompartment |8 andcomprises a conventional condenser lens assembly 22attached to the front wall of the light housing 2|. In advance of thecondenser lens assembly is a casing having a slot 90a in a side wallthereof communicating with a slideway 9| formed between verticalpartition walls 82 and 93 provided with registering light apertures. Aconventional illm or glass slide holder 84 may be shifted into and outof the slideway 8| in order to project successive pictures onto thescreen I5 in the same manner as previously described. The holder 94 hasthe usual slot 95 along the top thereof to receive the film or glassslide and a light aperture 98 registering with the light apertures inthe walls 82, 93 and the lens tube 25. The side panel I3 of the casing Ahas a slot 91 through which the slide holder 94 may be inserted into theprojector. It will be understood that the picture on the lm or glassslide will be projected upon the inner side of the screen by means vofthe mirrors 29 and 28 as previously described.

I claim:

1. A projector unit comprisinga casing having enclosing walls includingupright side walls and a front upright wall, the latter being providedwith a generally rectangular opening occupying the major width of thefront wall having its center oiset with respect to the center of thefront wall toward one side wall, a xed translucent viewing screenarranged in said front wall opening, a vertical partition within saidcasing eX- tending substantially from said front wall toward the rear ofthe casing and forming with the .adjacent side wall a projectorcompartment, a

projector in said compartment including a light source disposed adjacentthe front wall of the compartment and a projector lens in rear thereoffor directing light rays toward the rear of the casing. and verticallyextending angularly related reflecting surfaces within the casing forprojecting light rays from the projector onto the inner surface of saidscreen, said reflecting surfaces being horizontally opposed with onesurface positioned directly in rear of the projector lens and the othersurface positioned directly in rear of said screen.

2. A portable projector unit comprising a casing having enclosing wallsincluding top and bottom walls, upright side walls and a front uprightwalll the latter having an opening dimensioned to occupy the major areaof said front wall and oflset laterally therein to provide arelativelynarrow front wall portion at one side of the opening and asubstantially wider wall portion at the opposite side of the opening, atranslucent screen closing saidl opening, a projector compartment withinthe casing directly in rear of said narrow wall portion and disposedlaterally with respect to the screen, an angularly disposed mirror,means for mounting said mirror in the casing directly in rear of saidcompartment, a second mirror, means for mounting said second mirrorwithin the casing in rear of the screen and horlzontally opposed to saidfirst named mirror, and a projector mounted within said compartment andincluding a light source adjacent the front wall of the compartment anda projection lens in rear'thereof for projecting light rays in ahorizontal rearward direction upon said first named mirror and thence tothe second mirror and to the screen.

3. A projector unit comprising a casing having enclosing walls, aprojector mounted within the casing adjacent one side thereof and havingmeans for directing light rays in a direction toward the rear of thecasing, a viewing screen in the frontwall of the casing at one side ofthe projector, angularly vrelated upright reflecting surfaces within thecasing for projecting light rays generally horizontally from theprojector onto the inner surface of said screen, said reflectingsurfaces being horizontally opposed with one surface positioned directlyin rear of the projector and the other surface positioned directly inrear of said screen, and guide means for guiding a. film strip from theoutside through a slot in the top wall of the casing downwardly to theprojector and thence rearwardly toward the rear of the casing andthrough an aperture in a wall thereof.

4. A projector unit comprising a casing having enclosing walls, avertical partition within the casing extending from the front toward therear thereof and dividing the space therein into two compartments, aprojector mounted in one compartment and including a light sourcepositioned adjacent the front Wall thereof and a projector lens in rearof the light source for directing light rays toward the rear of thecasing, a translucent screen forming the major front wall of the othercompartment, means for reecting light rays from the projector onto thescreen, vertical guide means for guiding a iilm strip through theprojector in a vertical plane extending transversely of the casing, thetop wall of the casing having a guide slot aligned with said guide meansand through which the iilm strip is fed downwardly from the outside ofthe casing, and horizontally extending guide means for guiding the filmstrip from the projector toward the rear of the casing beneath theprojector lens and through an aperture in one of the walls thereof.

5. A projector unit comprising a casing having enclosing walls, avertical partition within the casing extending from the front toward therear thereof and dividing the space therein into two compartments, aprojector mounted in one compartment and including a light sourcepositioned adjacent the front wall thereof and a projector lens in rearof the light source for directing light rays toward the rear of thecasing, a translucent screen forming the major front wall of the othercompartment, m'eans for reflecting light rays from the projector ontothe screen, vvertical guide means for guiding a film strip through theprojector in a vertical plane extending transversely of the casing, thetop wall of the casing having a guide slot aligned with said guide meansand 05 through which the film strip is fed downwardly from the outsideof the casing, and horizontally extending guide means for guiding thefilm strip from the projector toward the rear of the casing beneath theprojector lens and through an aperture in one of the walls thereof, saidguide means including a fixed film strip guide extending from the topwall of the casing substantially to the projector and a pair ofrelatively yieldable vertically extending pressure plates substantiallysaid front wall occupying the remaining area l0 aligned with said fixedguide and interposed between the latter and said horizontally extendingguide means.

6. A projector unit comprising a casing having enclosing walls, a fixedtranslucent screen mounted in the front wall of the casing, a projectordisposed in the casing laterally with respect to the screen andincluding a light source and a projector lens in rear thereof fordirecting light rays from' the light source toward the rear wall of thecasing, means for reecting light rays from the projector lens onto thescreen and including a reflector arranged in rear of said lens, a filmstrip guide slot in the top wall of the casing, a film strip guidewithin the casing extending downwardly from said slot to the projector,and a film strip guide extending rearwardly from the projector belowsaid projector lens, the construction being such that the nlm strip isfed from above the casing downwardly through said guide slot and firstguide to the projector and thence rearwardly through the second guideand through an aperture in a wall of the casing.

7. A portable projector unit comprising a casing having enclosing walls,a ilxed viewing screen mounted in the front wall of the casing, aprojector disposed in the casing laterally with respect to the screenand including a light source and a projector lens in rear thereof fordirecting light rays from the light source toward the rear wall of thecasing, said projector having a film gate, means for reflecting lightrays from the projector lens onto the screen Aand including a reflectorarranged in rear of said lens, a film strip guide slot in the top wallof the casing,

guide means for guiding the film' strip'continuously from said slot tothe film gate, and means for guiding the film strip continuously fromsaid gate rearwardly below the projector lens to the rear of the casingand through an aperture in a Wall of the casing.

8. A portable projector unit comprising a casing having enclosing walls,a fixed translucent screen mounted in the front wall of the casing, aprojector disposed in the casing laterally with respect to the screenand including a light source and a projector lens in rear thereof fordirecting light rays from the light source toward the rear wall of thecasing, said projector having a film gate, means for reflecting lightrays from the projector lens onto the screen and including a reflectorarranged in rear of said lens, a film strip guide slot in the top wallof the casing, means for guiding the lm strip downwardly from said slotthrough the projector and including a fixed continuous guide extendingfrom the slot to said gate and relatively yieldable guide memberscommunicating with said xed guide and mounted in the projector, andmeans for guiding the film strip continuously from said relativelyyieldable guide 'members rearwardly and below the projector lens to anaperture in a wall of the casing and thence exteriorly of the casing.

9. A portable projector unit comprising a casing having enclosing wallsincluding top and bottom walls, upright side walls and a front uprightwall, the latter having an opening occupying a, predetermined area ofsaid wall, a viewing screen closing said opening, a projectorcompartment within the casing disposed laterally with respect to saidscreen, the portion of l of for projecting light rays in a horizontalArearward direction upon said first named mirror and thence to thesecond named mirror and to the screen.

ALFRED M. DAVOCK.

12., REFERENCES crrlm The following references arco! recordl in the tileof this patent: I

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